Properties

Label 2.83.a_aw
Base field $\F_{83}$
Dimension $2$
$p$-rank $2$
Ordinary yes
Supersingular no
Simple yes
Geometrically simple no
Primitive yes
Principally polarizable yes
Contains a Jacobian yes

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Invariants

Base field:  $\F_{83}$
Dimension:  $2$
L-polynomial:  $1 - 22 x^{2} + 6889 x^{4}$
Frobenius angles:  $\pm0.228844936469$, $\pm0.771155063531$
Angle rank:  $1$ (numerical)
Number field:  \(\Q(i, \sqrt{47})\)
Galois group:  $C_2^2$
Jacobians:  $665$
Cyclic group of points:    no
Non-cyclic primes:   $2$

This isogeny class is simple but not geometrically simple, primitive, ordinary, and not supersingular. It is principally polarizable and contains a Jacobian.

Newton polygon

This isogeny class is ordinary.

$p$-rank:  $2$
Slopes:  $[0, 0, 1, 1]$

Point counts

Point counts of the abelian variety

$r$ $1$ $2$ $3$ $4$ $5$
$A(\F_{q^r})$ $6868$ $47169424$ $326940817396$ $2253554325651456$ $15516041182347054868$

Point counts of the curve

$r$ $1$ $2$ $3$ $4$ $5$ $6$ $7$ $8$ $9$ $10$
$C(\F_{q^r})$ $84$ $6846$ $571788$ $47484910$ $3939040644$ $326941261422$ $27136050989628$ $2252292068511454$ $186940255267540404$ $15516041177488256286$

Jacobians and polarizations

This isogeny class is principally polarizable and contains the Jacobians of 665 curves (of which all are hyperelliptic):

  • $y^2=61 x^6+66 x^5+63 x^4+50 x^3+19 x^2+42 x+36$
  • $y^2=39 x^6+49 x^5+43 x^4+17 x^3+38 x^2+x+72$
  • $y^2=71 x^6+62 x^5+67 x^4+8 x^3+75 x^2+16 x+42$
  • $y^2=59 x^6+41 x^5+51 x^4+16 x^3+67 x^2+32 x+1$
  • $y^2=44 x^6+79 x^5+43 x^4+69 x^3+7 x^2+37 x+78$
  • $y^2=5 x^6+75 x^5+3 x^4+55 x^3+14 x^2+74 x+73$
  • $y^2=63 x^6+41 x^5+20 x^4+2 x^3+6 x^2+47 x+13$
  • $y^2=20 x^6+21 x^5+9 x^4+48 x^3+49 x^2+62 x+37$
  • $y^2=40 x^6+42 x^5+18 x^4+13 x^3+15 x^2+41 x+74$
  • $y^2=34 x^6+12 x^5+11 x^4+18 x^3+63 x^2+x+45$
  • $y^2=68 x^6+24 x^5+22 x^4+36 x^3+43 x^2+2 x+7$
  • $y^2=27 x^6+56 x^5+14 x^4+2 x^3+60 x^2+49 x+24$
  • $y^2=54 x^6+29 x^5+28 x^4+4 x^3+37 x^2+15 x+48$
  • $y^2=12 x^6+11 x^5+34 x^4+81 x^3+54 x^2+58 x+38$
  • $y^2=24 x^6+22 x^5+68 x^4+79 x^3+25 x^2+33 x+76$
  • $y^2=59 x^6+41 x^5+3 x^4+74 x^3+73 x^2+26 x+47$
  • $y^2=56 x^6+76 x^5+82 x^4+66 x^3+16 x^2+15 x+53$
  • $y^2=29 x^6+69 x^5+81 x^4+49 x^3+32 x^2+30 x+23$
  • $y^2=23 x^6+66 x^5+65 x^4+50 x^3+26 x^2+81 x+65$
  • $y^2=51 x^6+63 x^5+47 x^4+67 x^2+6 x+40$
  • and 645 more

Decomposition and endomorphism algebra

All geometric endomorphisms are defined over $\F_{83^{2}}$.

Endomorphism algebra over $\F_{83}$
The endomorphism algebra of this simple isogeny class is \(\Q(i, \sqrt{47})\).
Endomorphism algebra over $\overline{\F}_{83}$
The base change of $A$ to $\F_{83^{2}}$ is 1.6889.aw 2 and its endomorphism algebra is $\mathrm{M}_{2}($\(\Q(\sqrt{-47}) \)$)$

Base change

This is a primitive isogeny class.

Twists

Below are some of the twists of this isogeny class.

TwistExtension degreeCommon base change
2.83.ay_ly$4$(not in LMFDB)
2.83.a_w$4$(not in LMFDB)
2.83.y_ly$4$(not in LMFDB)

Below is a list of all twists of this isogeny class.

TwistExtension degreeCommon base change
2.83.ay_ly$4$(not in LMFDB)
2.83.a_w$4$(not in LMFDB)
2.83.y_ly$4$(not in LMFDB)
2.83.am_cj$12$(not in LMFDB)
2.83.m_cj$12$(not in LMFDB)